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Fig. 1C. 37-year-old man with decreasing renal function who was
referred for sonography to exclude hydronephrosis. After immunosuppression was
decreased in patient, mass became markedly smaller and renal function
improved. Longitudinal spectral Doppler sonogram of renal transplant shows
right iliac artery before anastomosis with peak systolic velocity of 0.91
m/sec. Corrected angle of insonation slightly exceeds 60°, which may lead
to overestimation of peak systolic velocity.